David Masson, The Life of John Milton Volume 3 1643-1649
“ Imagine farther that this Army had somehow come to be constituted, through its entire mass, on Cromwell's extraordinary principle, announced by him to Hampden at the beginning of the war, that the power of an army depends ultimately on the "spirit," or intrinsic moral mood, of the individuals composing it. Imagine that the atoms of this army were all "men of a spirit," men who had not fought as hirelings, but as earnest partakers in a great cause. Imagine them, if you like, as an army of fanatics. This phrase, however, might mislead, unless qualified. ”
